Solis II is a quality photochromic lens that adapts quickly to changes in daylight and UV radiation by changing its color. They have excellent clarity indoors and outdoors, within 1 minute the lens can get dark up to 67%. The maximum darkness it can receive is 85% outdoors and within 5 minutes it can return to 70% of its clarity until it becomes completely clear again indoors. It blocks 100% of UV radiation by protecting the eyes. Solis II is a very high quality option at an affordable price and has a 2 year warranty. It is combined with the Clarus II multilevel coating and has a 24-month warranty on coatings. Available in degrees where the algebraic sum, in your recipe of Sph and Cyl is from +4.00 to +4.00, while Sph is from +9.25 to -13.00 (Sph is its grade myopia or hyperopia while Cyl is the degree of astigmatism).